Standard Products
UT54ACS85/UT54ACTS85
4-Bit Comparators
Datasheet November 2010 www.aeroflex.com/logic
FEATURES 1.2μ CMOS
- Latchup immune High speed Low power consumption Single 5 volt supply Available QML Q or V processes Flexible package
- 16-pin DIP - 16-lead flatpack UT54ACS85 - SMD 5962-96536 UT54ACTS85 - SMD 5962-96537
DESCRIPTION
The UT54ACS85 and the UT54ACTS85 are 4-bit magnitude comparators that perform comparison of straight binary and straight BCD (8-4-2-1) codes. Three fully decoded decisions about two 4-bit words (A, B) are made and are externally available at three outputs. Devices are fully expandable to any number of bits without external gates. The cascading paths of the devices are implemented with only a two-gate-level delay to reduce overall comparison times for long words. An alternate method of cascading which further reduces the comparison time is shown in the typical application data.
The devices are characterized over full military temperature range of -55°C to +125°C.
LOGIC SYMBOL
A0 (10) 0 COMP
A1 (12) A2 (13)
A
A3 (15) 3
(A
B)IN (4) >
B0 (9) 0
B1 (11) B2 (14)
B
< (7) (A (5) (A>B)OUT
B3 (1) 3
Note:
1. Logic symbol in accordance with ANSI/IEEE standard 91-1984 and IEC
Publication 617-12.
PINOUTS
16-Pin DIP Top View
B3
(AB)IN (A>B)OUT (A=B)OUT (AB)IN (A>B)OUT (A=B)OUT (AB3
X
X
X
A3B2
X
X
A3=B3 A2B1
X
A3=B3 A2=B2 A1B0
A3=B3 A2=B2 A1=B1 A0B
AB H L H L H L H L H L L L H
OUTPUTS AB
A1 B1
(12) (11)
A0
(10) (9)
B0
2
(5) A>B
(6) A=B
(7) A